mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent off-white; Luster: Vitreous to greasy; Crystal structure: Trigonal (often massive in vein deposits); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent off-white
Luster: Vitreous to greasy

Identified July 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in hydrothermal veins and pegmatites through the precipitation of silica-rich fluid under heat and pressure. The white, milky opacity is caused by microscopic fluid inclusions trapped during rapid crystal growth.

Uses & applications

Widely used in decorative landscaping, glass manufacturing, electronics (silicon source), and abrasives. Also popular among amateur rockhounds and mineral collectors.

Geological facts

Milky quartz is one of the most common quartz varieties on Earth. The milky appearance is created by tiny gas or liquid bubbles trapped within the crystal structure millions of years ago.

Field identification & locations

Identified by its white color, ability to scratch glass (hardness 7), lack of cleavage, and glassy-to-greasy luster on fresh surfaces. Extremely abundant worldwide along riverbeds, beaches, and mountainous areas.